diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index c125068..8d035f9 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -61,14 +61,14 @@ def test_input
 # Returns test output filename.
 #
 def test_output
-  'recording.mkv'
+  "recording-#{Time.now.to_i}.mkv"
 end
 
 #
 # Returns test log filename.
 #
 def test_log_file
-  'screen-recorder.log'
+  "screen-recorder-#{Time.now.to_i}.log"
 end
 
 #